Impacts of NO<sub>2</sub> on Urban Air Quality and Causes of Its High Ambient Levels: Insights from a Relatively Long-Term Data Analysis in a Typical Petrochemical City in the Bohai Bay Region, China.

Toxics · 2025 · PMC11946341 · PMID 40137535

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showed a trendno p-value reported

Concentration Levels From 2017 to 2023, the annual mean values of NO 2 in Dongying showed a trend of “increase-decrease-stabilization” ( Figure 2 ).

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a decreasing trendno p-value reported

Conversely, on NO 2 -NHH days, after the NO 2 concentration rises during the evening peak, it shows a decreasing trend along with VOCs in the early morning.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.

Impacts of NO&lt;sub&gt;2&lt;/sub&gt; on Urban Air Quality and Causes of Its High Ambient Levels: Insights from a Relatively Long-Term Data Analysis in a Typical Petrochemical City in the Bohai Bay Region, China.

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Impacts of NO<sub>2</sub> on Urban Air Quality and Causes of Its High Ambient Levels: Insights from a Relatively Long-Term Data Analysis in a Typical Petrochemical City in the Bohai Bay Region, China.